4N5L

Crystal structure of (R)-3-hydroxybutyryl-CoA dehydrogenase from Ralstonia eutropha


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.248 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Crystal structure of (R)-3-hydroxybutyryl-CoA dehydrogenase PhaB from Ralstonia eutropha

Kim, J.-E.Chang, J.H.Kim, E.-J.Kim, K.-J.

(2014) Biochem Biophys Res Commun 443: 783-788

  • DOI: https://doi.org/10.1016/j.bbrc.2013.10.150
  • Primary Citation of Related Structures:  
    4N5L, 4N5M, 4N5N

  • PubMed Abstract: 

    (R)-3-hydroxybutyryl-CoA dehydrogenase PhaB from Ralstonia eutropha H16 (RePhaB) is an enzyme that catalyzes the NADPH-dependent reduction of acetoacetyl-CoA, an intermediate of polyhydroxyalkanoates (PHA) synthetic pathways. Polymeric PHA is used to make bioplastics, implant biomaterials, and biofuels. Here, we report the crystal structures of RePhaB apoenzyme and in complex with either NADP(+) or acetoacetyl-CoA, which provide the catalytic mechanism of the protein. RePhaB contains a Rossmann fold and a Clamp domain for binding of NADP(+) and acetoacetyl-CoA, respectively. The NADP(+)-bound form of RePhaB structure reveals that the protein has a unique cofactor binding mode. Interestingly, in the RePhaB structure in complex with acetoacetyl-CoA, the conformation of the Clamp domain, especially the Clamp-lid, undergoes a large structural change about 4.6 Å leading to formation of the substrate pocket. These structural observations, along with the biochemical experiments, suggest that movement of the Clamp-lid enables the substrate binding and ensures the acetoacetyl moiety is located near to the nicotinamide ring of NADP(+).


  • Organizational Affiliation

    Structural and Molecular Biology Laboratory, School of Life Sciences and Biotechnology, Kyungpook National University, Daehak-ro 80, Buk-ku, Daegu 702-701, Republic of Korea.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Acetoacetyl-CoA reductase
A, B
270Cupriavidus necator H16Mutation(s): 0 
Gene Names: phbB
EC: 1.1.1.36
UniProt
Find proteins for P14697 (Cupriavidus necator (strain ATCC 17699 / DSM 428 / KCTC 22496 / NCIMB 10442 / H16 / Stanier 337))
Explore P14697 
Go to UniProtKB:  P14697
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP14697
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.248 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.912α = 90
b = 94.341β = 90
c = 137.26γ = 90
Software Package:
Software NamePurpose
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-12-11
    Type: Initial release
  • Version 1.1: 2014-04-23
    Changes: Database references
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Refinement description